This document is a guide to cables and connectors for Catalyst
6500/6000, 5500/5000, and 4500/4000 series switching modules and Catalyst
2900/3500 XL, 2940, 2970, 2950/2955, 3550, and 3750 series fixed-configuration
switches. AC power supplies, connectors, and cords for these switches are also
covered.

You should identify the part or model number of your switch/supervisor,
switching module, or power supply in order to use this document effectively. Do
this by visual inspection, or issue the
show
module command where possible.

Different Catalyst Supervisor Engines use either a rolled or a
straight-through cable in order to connect a terminal or modem to the console
port. Refer to these documents for information on how to connect a terminal or
modem to the console port of Catalyst series switches:

Auxiliary (AUX) ports on Layer 3 (L3) switches or modules behave much
the same way as AUX ports on routers and are used to connect modems. Refer to
Modem-Router
Connection Guide for information on how to connect a modem to an AUX
port.

A common question that concerns RJ-45 unshielded twisted pair (UTP)
Ethernet cable concerns how to distinguish between rolled, straight-through,
and crossover cables, and when to use them. Use the comparison guide found in
the
Types
of RJ-45 Cabling section of
Cabling
Guide for Console and AUX Ports in order to see the difference between
these cables.

Crossover and straight-through cables are used in order to connect
switch ports or interfaces to network devices. Consult this table in order to
see when to use each of these cable types. Find the device in the left-hand
column and match it up with another device in the top row. The intersection of
these two devices gives you the cable type used to connect them together.

Hub

Switch

Router

Workstation

Hub

Crossover

Crossover

Straight

Straight

Switch

Crossover

Crossover

Straight

Straight

Router

Straight

Straight

Crossover

Crossover

Workstation

Straight

Straight

Crossover

Crossover

Note: The ports on Catalyst switches that run Cisco
IOS® Software (Native) can be configured to act as
Layer 2 (L2) or Layer 3 (L3) ports. When you connect the RJ-45 cable from a
Layer 3 port, which acts as a router port, to other devices, use the previous
table. In summary, the cables used do not change, regardless of whether the
port is configured to be in Layer 2 (switch port) or Layer 3 (router port)
mode.

These diagrams show some of the most common cable types and connectors
used on Catalyst switches.

RJ-45

RJ-21 Telco

This is used in order to connect to 10/100 or 10/100/1000
Ethernet ports and 1000Base-T Gigabit Interface Converter (GBIC) or small form
factor pluggable (SFP) GBIC ports. 10/100/1000 Ethernet ports must use four
twisted-pair Category 5, 5e or 6 cables.

This is used in order to connect to 10/100BASE-TX RJ-21 telco
interfaces. Use Category 5 UTP cables with male RJ-21.

MT-RJ Fiber-Optic

SC Fiber-Optic

This is used in order to connect to 100Base-FX fiber-optic
ports. Use multimode fiber (MMF) cables with MT-RJ connectors.

This is used in order to connect to 100Base-FX, 1000Base-SX,
Long Wavelength/Long Haul (LX/LH) and ZX fiber-optic ports or GBICs. Use MMF or
single-mode fiber (SMF) fiber-optic cable.

LC Fiber-Optic

GigaStack

This is used in order to connect to SFP fiber-optic module
ports.

This is used in order to connect to GigaStack GBIC ports. Cisco
GigaStack technology uses proprietary GBICs and cables.

StackWise

This is used in order to connect to StackWise ports on the rear
panel of Catalyst 3750 switches.
Cisco StackWise technology uses proprietary connectors and
cables.

Many Catalyst switches, Supervisor Engines and switching modules have
removable Gigabit Interface Converters (GBICs) or small form factor pluggable
(SFP)-type connectors. These diagrams show some of the most common�GBIC and SFP
connectors used on Catalyst switches.

GBIC and SFP support depends on the platform and software version.
Refer to these documents for GigabitEthernet system requirements, as well as
GBIC system requirements, Coarse Wave Division Multiplexer (CWDM) GBIC,
Gigastack GBIC, and SFP system requirements:

1Category 3 UTP cable can
transmit data at speeds of up to 10 Mbps and therefore is only used for 10 Mbps
network devices. Catalyst 5000 10Base-T telco switching modules can use
Category 3 cable, but Category 5 cable is required for all other 10/100 Base-TX
switching modules.

2LX/LH GBICs require a
mode-conditioning patch cord between the GBIC and MMF. Refer to the
Mode-Conditioning Patch Cord section of the document
Connector
and Cable Specifications for more information.

Identify the switch chassis part number. Use this table in order to
match up the part number with the type of connector and cable used.

Note: The Catalyst 3750 switch ships with a 0.5-meter StackWise cable that
you can use in order to connect the StackWise ports on the rear panel. You can
also order these StackWise cables from your Cisco sales representative:

Identify the switch chassis or expansion module part number. Use this
table in order to match up the part number with the type of connector and cable
used.

Note: This guide does not cover the WS-C2912-LRE-XL or WS-C2912-LRE-XL
switches. Refer to theLong-Range
Ethernet Ports section of
Product
Overview (Catalyst 2900 Series XL switches) for more information on
cabling and specifications.

Note: Some Catalyst 3500XL switches support the GigaStack GBIC, which
requires a Cisco proprietary cable of either CAB-GS-50CM or CAB-GS-1M.

In this section you see the summary of AC power supplies, power
connectors, and cords for Catalyst 6500/6000, 5500/5000 and 4500/4000 series,
and�Catalyst 3750, 2950,�2940, and�2900/3500XL series switches. Refer to the
Power Installation Guidelines in the tables that correspond in the next section
for international power requirements, DC power requirements, and other
technical specifications.

Different Modules require different amount of power. Inline Power
modules supplies the power to the IP phones. Cisco has inline power module to
power the IP phones. You have to choose the correct power supply in order to
support the various line cards, modules and Supervisor Engines on the switch.
Cisco offers a tool called the
Cisco Power calculator
which can be used in order to choose the correct power supply for your switch.
Launch the Cisco Power
calculator and fill out the Product family, Supervisor Engine, Input
voltage, line cards and the number of PoE devices. IP phones are the example
for PoE devices and most of the IP phones belong to IEEE 802.3af Device - Class
2 (7W). Then the power calculator shows the results of different choices of
Power Supplies. From that you can choose the required power supply. The power
supplies successfully operate at their greatest capacity if the input voltage
is between 200 and 240 volts AC.

This table is a quick reference for the available power supplies and
cables in North American standard. Refer to
Catalyst
6500 Power supply specifications for the detailed specifications you
can. These few points are important to know:

The 950W (PWR-950-AC), 950W DC (PWR-950-DC) and 1400W AC
(PWR-1400-AC) are used only with the Catalyst 6503 and Catalyst 6503-E
Switches.

The Power supplies 1000W and 1300W can be used only with Catalyst
6506, 6509, and 6509-NEB-A switches. The Supervisor Engines SUP32 and SUP720
are incompatible when 1000W and 1300W power supplies are used.

With a fully populated Catalyst 6513 switch, two 2500 W power
supplies are not fully redundant.

If you operate the 2500 W power supply at the low range input (100 to
120 VAC), it is not redundant in a fully populated Catalyst 6509, Catalyst
6509-E, Catalyst 6509-NEB, or Catalyst 6509-NEB-A switch.

The Power supplies 2500W, 2700W, and 3000W can operate at two
different voltage levels (110Vac and 220Vac). The Power supply output depends
on the supplied input AC power. This table shows the power ouput:

Power Supply

Power Output at 110Vac, 16A

Power Output at 220Vac, 16A

2500W

1300W

2500W

2700W

1350W

2700W

3000W

1400W

3000W

The AC power cords are hardwired to the 4000W Power supplies
(WS-CAC-4000W-US=). It supports only NEMA L6-30.

The 6000W power supply cannot be installed in the Catalyst 6503,
Catalyst 6503-E, and Catalyst 6504-E switch chassis.

When 6000W power supply is used with the chassis Catalyst 6506, 6509,
6509-NEB, and 6509-NEB-A, it operates at 4000W maximum output. It operates at
6000W maximum output when it is used with Catalyst 6506-E, 6509-E, and
6513.

6000W power supply has two AC Power inputs. These are the various
combinations of AC inputs and the corresponding net power output:

6000W Power Supply Power Options

AC Input 1

AC Input 2

Net Power Supply Output

110Vac, 16A

Not Connected

No Power Output

Not Connected

110Vac, 16A

No Power Output

110Vac, 16A

110Vac, 16A

2900W

220Vac, 16A

Not Connected

2900W

Not Connected

220Vac, 16A

2900W

110Vac, 16A

220Vac, 16A

2900W

220Vac, 16A

110Vac, 16A

2900W

220Vac, 16A

220Vac, 16A

6000W

Note: If you have 110Vac power inputs, you have to connect both the AC
inputs of the 6000W power supply in order to power on the switch.

The Catalyst 6500 series switches allow you to mix AC-input and
DC-input power supplies in the same chassis.

The modules have different power requirements, and some configurations
require more power than a single power supply can provide. The power management
feature allows you to power all installed modules with two power supplies. But,
redundancy is not supported in this configuration because the total power drawn
from both power supplies is at no time greater than the capability of one
supply. Refer the
Power
Management and Environmental Monitoring of the Catalyst 6500 Software
Configuration Guide for the detailed explanation of Power redundancy.

Note: This document does not discuss the total power available with the
currently shipped power supplies for Catalyst 6500/6000 series switches or the
amount drawn from each Catalyst 6500/6000 series line card. Refer to the
document
Power
Management for Catalyst 6000 Series Switches for this
information.